Collecting-tube for filters



(No Model.) S

G. H. MOORE. COLLECTING TUBE FOR FILTERS.

No. 473,011. Patented Apr. 19, 1892'.

WITNESSES: INVENTOR $7 4 W 4 /a.b@..%m

' ATM/M5751 UNITED STATES PATENT OFFICE.

GEORGE H. MOORE, OF NORWICH, CONNECTICUT.

COLLECTING-TUBE FOR FILTERS.

SPECIFICATION forming part of Letters Patent No. 473,011, dated April 19, 1892. Application filed January 30, 1889. Serial No. 298,156. (No model.)

To all whom it may concern.-

Be -it known that I, GEORGE H. MOORE, of Norwich, in the-county of New London and State of Connecticut, have invented a new and useful Improvement in Collecting-Tubes for Filters, of which the following is a specification, reference being had to the accompany= ing drawings, forming part thereof.

My invention relates to the tubes by which filtered water is conducted from and washwater is conducted into the filtering chamber or compartment of filters; and it has for its object to provide a tube for this purpose, which, while affording a free water-way for filtered and cleansing water, will be protected in such manner that the particles composing the filtering medium will be prevented from escaping from the filtering-chamber through said tubes and from obstructing the passage through the latter.

A further object of the invention is to combine with such a tube a guard so constructed that as the cleansing-water enters the filtering-chamber through the tube and issues from beneath said guard it will be diffused in such manner as to thoroughly agitate and wash the entire mass of filtering material.

To these ends my invention consists in a collecting-tube composed of a tube provided with a series of comparatively large perforations, a sleeve of finely-perforated metal to surround said tube, and an imperforate guard surrounding said tube and shield, as hereinafter fully described, and particularly pointed out in the claims.

Referring to the drawings, in which like letters designate like parts in the several figures, Figure 1 is a vertical sectional view of the tube, sleeve, and a conical guard. Fig. 2 is a side elevation showing a guard of pyramidal form. Fig. 3 is a side elevation of a cylindrical formof guard. Fig. 4 is a side elevation of the tube proper. Fig. 5 is a similar View of the sleeve. Fig.6 is avertical section, on a larger scale, of the parts shown in Figs. 3, 4, and 5 after the same are assembled for use.

The letter A designates the tube proper, which is preferably made of brass, and is threaded at its lower end to enable it to be screwed into the false bottom of a filter or into the horizontally-disposed collectingpipes,

which are frequently used in lieu of said-false bottom. In either case the tube A projects upwardly into the mass of comminuted material forming the filter-bed. The tube A preferably has at its upper end a squared hub ato receive a wrench and facilitate screwing it in position and has between its ends a series of perforations a, which, as indicated in Fig. 4, maybe of any shape, and which will be of sufficient dimensions to afford a large water-way into and through the tube. At its lower end the tube is preferably provided with a slight shoulder a to receive and support the sleeve 13. Said sleeve B consists of a cylinder of finely-perforated metal of proper size to closely fit the tube A, and hence, while no obstruction is thereby caused to the passage of water to and from the tube, the particles composing the filtering material are prevented from entering the tube and are retained within the chamber. As the said particles by being packed closely around said sleeve, however, would obstruct the passage of the water, I employ in connection with said tube and sleeve an imperforate guard adapted to entirely inclose said tube and sleeve and having an open water-way either atthe bottom thereof or at some point therein to afford passage to the water. As shown in Fig. 1, said guard C is conical in form and is supported upon feet 0, whereby an open water-way is formed beneath its base. The guard D (shown in Fig. 2) is pyramidal in form and is similarly supported. The guard E (shown in Figs. 3 and 6) is cylindrical in form and is supported by being bolted to the top of the tube A. The guard E is of sufficient diameter to aiford a free water-way between its inner surface and the tube, as shown. In each of the formsshown the filtered water passes beneath the base of the guard to and through tube A into the compartment beneath the false bottom of the filter, or into collecting-pipes, as the case may be, and said guard effectually prevents the massing of the filtering material against sleeve B. During the washing process the cleansingwater passes upwardly through the tubes A and issues from beneath the guards into the filtering-chamber at the bottom of the latter. It is desirable that said cleansing-water be diffused as much as possible upon its entrance to the chamber, in order to insure the thorough agitation of the entire bed of filtering material, and this result is secured in guards C and D by their enlarged bases. To enable guard E to secure this function, I provide it with an annular flange e, which is preferably located at the bottom thereof, as shown in Fig. 6, and by full lines in Fig. 3, but which may be located at other points thereon, as

represented by broken lines in the latter figure. Said flange serves as a spreader to diffuse the ascending current of cleansing-water, and, there being a number of the tubes in each filter, the filtering material is thoroughly agitated and cleansed. I

I have deemed it to be unnecessary to show a filter in the drawings, for the reason that the manner of using collecting-tubes therein is familiar to persons skilled in the art and because my invention relates wholly to the construction of the tube and its guard.

The collecting-tube herein described is simple and inexpensive in construction and etfectually secures that great desideratum in large filtersviz., a free water-way to and from the bottom of the filtering-chamber, which cannot become clogged by the filtering material. In addition to such function the tube and its guard secure the even diffusion of the cleansing-water throughout the mass of filtering material, which is equally important.

It is obvious that the forms of guard shown in Figs. 1 and 2 could be supported by being bolted to the top of tube A, like that shown in Fig. 6, and when used in connection with collecting-pipes instead of a false bottom they will preferably be so supported.

Modifications in the details of construction other than those herein mentioned can be made without departing from the spirit of my invention.

Having thus fully described my invention, what 1 claim, and desire to secure by Letters Patent, is

1. In a collecting-tube for filters, tube A, having therein the series of perforations a and having mounted thereon in positions to cover said perforations the finely-perforated sleeveB, in combination with an imperforate guard inclosing said tube and sleeve, said guard being closed at the top and having an uncovered open bottom and having an open water-way between its inner surface and said tube, arranged and operating substantially as described.

2. In a collecting-tube, tube'A, having the series of perforations a therein, sleeve B, of finely-perforat ed metal, closely embracingsaid tube, and cylindrical guard E, superposed upon said tube, said guard having an open water-way between its inner surface and said tube and having an annular flange e to serve as a spreader for an ascending current of water through said tube, combined and operating substantially as described.

GEORGE H. MOORE.

Witnesses:

W. H. CHAPMAN, J. E. CHAPMAN. 

